Update README.md (#47)
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2. By default, the name server cluster uses host network IP (because ```hostNetwork: true```). If you set ```hostNetwork: true```, and need to exposure the name server cluster to the outside, you can use the Service:
```
-$ kubectl apply -f example/rocketmq_cluster_service.yaml
+$ kubectl apply -f example/rocketmq_v1alpha1_cluster_service.yaml
service/rocketmq-service created
```
